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Krissa Skogen

kskogen's picture
Conservation Scientist Manager, Conservation and Land Management Internship Program
Chicago Botanic Garden

kskogen at chicagobotanic dot org

Projects
Assessing the impact of drought on plant-pollinator and plant herbivore interactions (2018)

Many consequences associated with global climate change directly affect Earth’s ecosystems, including changing precipitation patterns associated with increased drought frequency and intensity in arid regions. Water availability has a strong influence on the distribution of plant species globally and can impact the allocation of resources within individual plants. In times of limited water...


Floral traits at the intersection of herbivory and pollination in evening primroses (2017)

The Dimensions of Biodiversity: Landscapes of Linalool grant broadly examines the role of floral scent in mediating pollinator and herbivore interactions and in driving the diversification of evening primroses at multiple evolutionary timescales. Due to their opposing effects on plant fitness, herbivores and pollinators have the potential to influence the evolution of floral phenotypes across...


Staying connected: How floral variation and local pollinators shape gene flow in downy Indian paintbrush (2017)

Different floral traits-- the color, shape, and scent of flowers-- can attract different groups of pollinators to flowers of a particular species. For many flowering plants, pollinators are primarily responsible for moving the genes of plants (via pollen) between different individuals, and among populations. In population genetics, the movement of gene is termed gene flow, which affects many...


Floral trait variation in evening primroses (Onagraceae) (2016)

The evening primrose family, Onagraceae, shows spectacular inter- and intra-specific variation in floral morphology, floral scent and mating systems. As part of a large NSF-funded Dimensions of Biodiversity project, we have documented both inter- and intra-specific variation in floral traits in 14 species of Onagraceae and have found striking intraspecific polymorphisms in many taxa. In these...


Growing apart?: Documenting range-wide floral variation to investigate a possible pollinator shift in Castilleja sessiliflora (2016)

The adaptation of plants to different kinds of pollinators is considered a driving force of the floral diversity seen among angiosperms. Shifts between pollinators that are accompanied by changes in floral traits provide a key opportunity to investigate the role of pollinators in driving floral trait evolution. Many studies of pollinator shifts, however, fail to address changes in pollinators...


How bad can inbreeding be? Mating system variation and inbreeding in Oenothera primiveris. (2016)

Mating system is directly related to inbreeding and in some cases will lead to a loss of fitness known as inbreeding depression. The relation between mating system and ID has been study in different organisms, and there is a strong relationship but variation is inevitable. In self-incompatible populations (can't self), they will express greater inbreeding depression than self-compatible, due...


Inheritance of Scent (2015)

Our studies of Oenothera harringtonii (Arkansas Valley Evening Primrose) have revealed geographic variation of floral scent compounds despite evidence of high gene flow. Scent variation in O. harringtonii is mainly associated with a single compound, linalool; which is sometimes found in large quantities. We observe geographic variation in floral scent and have identified two primary chemotypes...


Pollinator traits & characteristics of flowers in the evening primrose family (2015)

Angiosperms, or flowering plants, appeal to various pollinators by exhibiting floral characteristics such as color, scent, and the times of the day their petals open based on the pollinators they wish to attract (Dodd et al 1999) These evolutionary adaptations increase the chances that pollination by a particular pollinator will occur and, thus, increase the likelihood that a seed will be...


Scent variation: its role in attracting both pollinators and herbivores in Evening Primroses (2015)

The plant tribe Onagreae (Onagraceae; the evening primrose family) and its associated insects pollinators (Sphingidae hawkmoth) and herbivores (Mompha microlepidoptera and Hawkmoth larvae) is a model systems for studying the role of floral scent in shaping the evolution of plants and their associated organisms across western North America. Floral scent is known to be an important trait in...


Green Roof Ecology (2014)

Green roofs have the potential to provide habitat and other resources for native plant and animal species in urban environments. Previous research has found that a variety of such species do use green roofs but further investigation is needed to determine how these habitats can be designed to make greater contributions to urban biodiversity conservation. This project will focus on evaluating...


Scent variation: its role in attracting both pollinators and herbivores in Evening Primroses (2014)

The plant tribe Onagreae (Onagraceae; the evening primrose family) and its associated insects pollinators (Sphingidae hawkmoth) and herbivores (Mompha microlepidoptera and Hawkmoth larvae) is a model systems for studying the role of floral scent in shaping the evolution of plants and their associated organisms across western North America. Floral scent is known to be an important trait in...


Development of Molecular Markers for studies in Oenothera genus (2013)

Neutral genetic diversity within plants is often used to track important evolutionary processes including gene flow, species and population divergence, and evolutionary ancestry. Microsatellite primers are a useful way to quantify genetic diversity and track gene flow. In order to measure genetic diversity among these species, we need to first find marker regions...


Genetic variation and spatial distribution of Castilleja species along the west coast of the United States. (2013)

Castilleja is a taxonomically tricky and morphologically variable plant genus in the western United States. The species in this genus have been known to naturally hybridize and have overlapping ranges yet are considered distinct from one another. We will be comparing the genetic variation within a population of Castilleja species and among populations of Castilleja species on the west coast...


Characterization of Floral community within Gravel Hills (2012)

Gravel Hills are a rare fragmented habitat in the Upper midwest, and as a consequence they have a high frequency of species identified as rare or threatened. What makes this interesting is that this is a naturally fragmented habitat and therefore many of the species which are found on these hills have evolved to survive in this type of condition. As native ecosystems become increasingly...


Characterization of Floral diversity and host preferences of Parastic Plant; Castilleja coccinea in the Chicago Region (2012)

Castilleja coccinea is a semi-parasitic plant that produces flowers subtended by brightly colored bracts. In most cases the bracts of this species are red (coccinea= Latin word meaning "deep red") however many populations in the Chicago Region have yellowish bracts. We hope to map the variation of floral shape, color and major pollination throughout the region.As flower color is closely...


Pollen-mediated gene flow in fragmented and continuous populations of Oenothera harringtonii (Onagraceae), a threatened Colorado endemic (2012)

This project will determine the extent to which habitat fragmentation is affecting gene flow in Oenothera harringtonii, an annual Colorado endemic whose habitat is increasingly disturbed by numerous development activities. Oenothera harringtonii has night-blooming flowers that are pollinated primarily by hawkmoths in the evening and matinal bees in the early morning hours. Hawkmoths are known...